diff options
authorChristian Borntraeger <>2016-03-15 14:55:30 -0700
committerLinus Torvalds <>2016-03-15 16:55:16 -0700
commitea6eabb05b26bd3d6f60b29b77a03bc61479fc0f (patch)
parentd59b1087a98e402ed9a7cc577f4da435f9a555f5 (diff)
mm/debug_pagealloc: ask users for default setting of debug_pagealloc
Since commit 031bc5743f158 ("mm/debug-pagealloc: make debug-pagealloc boottime configurable") CONFIG_DEBUG_PAGEALLOC is by default not adding any page debugging. This resulted in several unnoticed bugs, e.g.<> or<> as this behaviour change was not even documented in Kconfig. Let's provide a new Kconfig symbol that allows to change the default back to enabled, e.g. for debug kernels. This also makes the change obvious to kernel packagers. Let's also change the Kconfig description for CONFIG_DEBUG_PAGEALLOC, to indicate that there are two stages of overhead. Signed-off-by: Christian Borntraeger <> Cc: Joonsoo Kim <> Cc: Peter Zijlstra <> Cc: Heiko Carstens <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
2 files changed, 21 insertions, 3 deletions
diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug
index 957d3da53ddd..a0c136af9c91 100644
--- a/mm/Kconfig.debug
+++ b/mm/Kconfig.debug
@@ -16,8 +16,8 @@ config DEBUG_PAGEALLOC
Unmap pages from the kernel linear mapping after free_pages().
- This results in a large slowdown, but helps to find certain types
- of memory corruption.
+ Depending on runtime enablement, this results in a small or large
+ slowdown, but helps to find certain types of memory corruption.
For architectures which don't enable ARCH_SUPPORTS_DEBUG_PAGEALLOC,
fill the pages with poison patterns after free_pages() and verify
@@ -26,5 +26,19 @@ config DEBUG_PAGEALLOC
that would result in incorrect warnings of memory corruption after
a resume because free pages are not saved to the suspend image.
+ By default this option will have a small overhead, e.g. by not
+ allowing the kernel mapping to be backed by large pages on some
+ architectures. Even bigger overhead comes when the debugging is
+ enabled by DEBUG_PAGEALLOC_ENABLE_DEFAULT or the debug_pagealloc
+ command line parameter.
+ bool "Enable debug page memory allocations by default?"
+ default n
+ depends on DEBUG_PAGEALLOC
+ ---help---
+ Enable debug page memory allocations by default? This value
+ can be overridden by debug_pagealloc=off|on.
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index fe4378fc0ab6..36a0a792f4f8 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -478,7 +478,8 @@ void prep_compound_page(struct page *page, unsigned int order)
unsigned int _debug_guardpage_minorder;
-bool _debug_pagealloc_enabled __read_mostly;
+bool _debug_pagealloc_enabled __read_mostly
bool _debug_guardpage_enabled __read_mostly;
static int __init early_debug_pagealloc(char *buf)
@@ -489,6 +490,9 @@ static int __init early_debug_pagealloc(char *buf)
if (strcmp(buf, "on") == 0)
_debug_pagealloc_enabled = true;
+ if (strcmp(buf, "off") == 0)
+ _debug_pagealloc_enabled = false;
return 0;
early_param("debug_pagealloc", early_debug_pagealloc);